Answered for Avon, Hendricks County.
Common under aphid-infested maple and linden in mid-summer. In Avon, overwhelmingly young, nursery-planted stock: only 3.4% of Avon's housing predates 1960, so the typical "big tree" here is a 20-to-30-year-old subdivision planting rather than a legacy shade tree, with exceptions in the White Lick Creek bottomland and the fencerow remnants left when farm fields were platted. Ash is gone, and Avon's street tree ordinance actively steers right-of-way planting toward tall shade-producing species, reserving ornamentals for spots where space genuinely prevents a large tree. Harmless in itself — it grows on the honeydew, not on the tree.
Overwhelmingly young, nursery-planted stock: only 3.4% of Avon's housing predates 1960, so the typical "big tree" here is a 20-to-30-year-old subdivision planting rather than a legacy shade tree, with exceptions in the White Lick Creek bottomland and the fencerow remnants left when farm fields were platted. Ash is gone, and Avon's street tree ordinance actively steers right-of-way planting toward tall shade-producing species, reserving ornamentals for spots where space genuinely prevents a large tree.
Black soot-like film on leaves, branches, cars and patio furniture below the tree.
Harmless in itself — it grows on the honeydew, not on the tree. It is a symptom. Treating the mould achieves nothing; find the aphids or scale above it.
Deal with the insect, and the mould weathers off.
4883 Gibbs Rd, Plainfield, IN 46168
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Distance measured from Avon.